Hello I recently bought a 1995 mustang gt 5.0 5 speed . The car ran great but recently it's been overheating, I live in phx az so It gets pretty hot. I noticed the temp gauge goes a little bit above the middle at times but it constantly goes up and down little by little but when I floor it the car slowly starts to heat up bad just a little bit before the red line. I'm not sure if I have a bad water pump or radiator. The car is fairly stock. It has a cobra 5.0 manifold, it is tuned and it has 4 inch mufflers that's about it so I find it pretty strange for it to overheat. I need help plz anything helps